Improvement in blanks for saw-teeth



C"atleti/PD Sitter JAMES EMERSON, OE TRENTON, NEW JERSEY.

Letters'Patent No. 108,990, dated November 8, 1870.

IMPROVEMENT IN BLANKS FOR SAW-TEE'TH.

The Schedule referred to in these Letters vPatent: and making part of the same.

To all whom 'it may concern:

Be it known that I, J AMEs E. Eornnsox, of .Trenton, in the county of Mercer and State of New Jersey, have invented acertain new and useful Improvement in Making Removable Teeth for Saws; and I do hercby declare the following to be a full, clear and exact description of the same, reference being had to the aeeompanying drawing making a part of this specification, in which- Figure l represents a rolled plate or bar ot' steel, from which the blanks that are to form the teeth are cut;

Figure 2 represents one of the blanks as sheared from the bar. A

Figure 3rcp1-'csents the blank in one ot' its advanced stages; and

Figures 4 and 5 represent the iinished saw-tooth'.

Similar letters of reference, where they occur in the` separate igures, denote like parts in all cases.

.Saw-teeth of almost all kinds, but removable sawteeth in particular, require more metal, more' thickness of metal, at the point than inthc body of the tooth; and this increased thickness'has heretofore been attained by placing the blank nndcra drop-die and upset-ting the metal, and so thickening `it at the part that-makes the point of' the tooth; or else the blank was Vforged out, both of which required the heating up of the steel to a degree that endangered 'the overheating ofthe metal, and so injuring it for its p urpose; or the blank wasI ground, so as t0 reduce it inthiekness in the body and leave it full at the cuttingpart of the tooth. 1This latter plan avoided the risk of overheating, but wasvery expensive.

To enable others skilled in the art to make and use my invention, I will proceed to describe the saine with reference to the drawing.

A represents a plate otsteel, which, in being rolled,

so as to form diamond-shaped blanks, as atA B, fig. 2. f

This bla-nk l may then be put under a drop-die, and a portion, o, cut out therefrom, so as to make it ofthe form shown at C, fig. 3;' or the plate A may bcput under the drop-die, and the blanks produced' at once thereby, as shown at'C, iig. 3; but I prefer the 51st-described plan of shearing, and then the drop-die. Figs.v 4and 5 represent how these' blanks may be shaped or filed up to fit similarly-shaped recesses in tl1csa\\'1`)late, having a notch at ll and grooved edges at of. Other-shaped fittings may be used; but these I haveshown answer a good purpose, and make a firm and substantial union with the saw-plate.

I am aware that it is a common practice to roll ont plates of metal so as to impart to ther'n thickened margins, and then to divide the same into blanks for .plo\vshares, mold-boards, '860; and [do not, therefore,

claim the application of this method to the making ot' blanks for saw-teeth; but

Vhat I do claim is Blanks for saw-teeth cut obliqncly from a rolled steel plate, ofthe shape in cross-section, herein describedand shown thatis to say, aplate havinga marginal swell or enlargement on both sides thereofat and near one edge, but otherwise of' unifrln thickness. I'

' JAMES E. EMERSON.

\Vi tnesses:

A. B. STOUGHTOX, EDMUND Masson. 

